Boiler



y 1935. H. J. KERR El AL 2,001,735

BOILER Filed Dec. 26, 1928 2 Sheets-Sheet l N F Q g I h I I Iii k g} II QQ i n I WW1: A H @w 1! N 1 a & J

KFQQQRN N Q Q 1 INVENT R5 M May 21, 1935. H. J. KERR El AL BOILER 2 Sheets-Sheet 2 Filed Dec.

INVENTO s jog/UV BY 2 2 WATTORNEYS Patented May 21', 1935 I if "UNITED fl-STATES PATENT OFFICE 2,001,735 m e i Howard J. KerrjWestfield, NFL, and has L.

,Langvand, Barberton, Ohio, assignors to The x Babcock & .Wilcox Company, Bayonne, N. J.,

a corporation of New Jersey AppIicatiOnDeeemberZG, 1928, Serial No. 328,570

. s Claims.

, This invention relates to sin v'ei and improved form ofboiler, particularly of the Stirling type.

and will "be. best understood from the following description. Inthe accompanying'drawing-s, in

5 which'there areishown selectedjembodimentsof the invention, v Fig. "l is a vertical 'sectional view' through a Stirling boiler constructed according to the in- 'vention. l Fig, 2 is a section onthe 1inej2-'.2' of Fig, ,1. Fig.3 is an'enlarged detailed view adjacent the steam outlet shown in Fig; 1. p V

V 1 Fig. l is a view corresponding to Fig. 1; but

showing a different form of theinventidnQ Fig; 5'is an'enlarged view showing the arrange-.

ment of baffles adjacent the steam outlet iriFig. 4. Referring first to Figs. 1,2 and3, the invention ,is shown as embodied. in a boiler disposed above.

a combustion chamber l to which heat is supplied from a suitable source exemplified by'a grate 2 beneath a combustion arch 3. The boiler ingone of the aforesaid banks oftubesh The particular. form of Ibaiiling," in, itself, forms no part of this invention, and therefore will not be described in detaili "It issufficient for the purposes "of this invention, that this baffling should form. the plurality of passes referred to above, inwhich are. disposed tubes leading to two drums instead'of one'atthe top. ends. I

.Fr'omthis arrangement of bathing. it will be seenthat the tubes connecting the lower drum to each "or". the front and middle upper drums are disposed some in a relatively hot pass; and some in a relativelyfcool pass, the hot gases from the combustion chamber being cooled by the bank l of tubes 8 before they reach the pass in which the second bank} isldisposed. Similarly, these gasesare cooled by the tubes. 9 beforeithey reach thetubes ill in the next pass. The gases may then pass out through the flue l I. p

I In the form shown, preferably the sole connection between the drums below the normal water lines therein is formed by means of the abovedescribed tubes and the-water drum. For example, the onlyconnection below the water levels in the drums 5 and 6 is furnished by means of the tubes in the bank 9 and the water drum 4. In otherwords, the usual water circulators lators [3 provides a smooth even support between upper drums have been omitted, and water in an upper drum returns to the steam making tubes'by passingdirectly to the water drum without passing through another top drum. In this form, the rear drum is provided with a steam outlet l2, and each of the drums 5 and 6 is connecte'd'directly to the drums "l by steam circu1ators'l3 and M respectively, Theseflcirculators form the sole'connections between the drum, above the, normal water levels therein. The middle drum 6 is provided with a gauge glass '6"; to indicate the water level therein, and feed water is supplied to the rear drum 1 at an inlet [5. Suitable baffling I6 is disposed in the drum 1 I should approximate the levels indicated by the lines is and Zll, but various causes may result in the levels more nearly approximating those indicatedby the lines 2| and 22 respectively. It.

has been found that by the novel arrangement of circulators and tubes described above, the level in the rear or steam outlet drum is maintained suflicientl'y low to greatly decrease the danger of priming. Moreover, the arrangement of circufor the roof 23 of the boiler casing.

{Referring nowto Figsge and 5, there isshown therein a boiler of .the same type as shown in Fig.1, and to Which similar numerals have in large part been applied. The numeraled parts within this drumbetween the circulator l4 and the outlet- I2. 'In thisjform therear drum 1 acts as a separator for anymqisture in the steam which is discharged thereintothrough' the steam circulators l3. InFig. 4, the various water levels are indicated by the same numerals as in Fig. 1.

'It is to be understood that these levels are only approximate. l

Referring to Fig; 5, it be seen that there will not be describedagain. In this form, how-' ever, the steam outlet I2 isarranged on the middle drum 6 and suitable bafiling is arranged is provided a. plurality of baflles 24, 25 and 26, I

providing atortuous pathfor the steam to follow fromthe circulators M to the outlet. While therelvhave been shown certain embodiments of the invention, it is to be understood that other forms may be. devised whicheome within the scope of the invention as defined in the appended claims.

ting, a middle steam and water drum located between two similar drums at the top of the setting,

tubes leading from said drums to a lower water chamber, primary bafiies dividing the tubes into a plurality of separated banks located in separate gas passes extending through the setting; alower number of tubes in a bank leadingto a drum from which a greater number of tubes extend downwardly through an adjacent gas pass ofhigher temperature, the tubes in abank being bent at their upper ends so as to constitute diverging groups of tubes, secondary baflies located between adjacent upper drums and between said diverging groups of tubes, said'secondary baflies forming gas pass walls guiding the furnace gases at their turns, a steam 'off-takeconnection com inunicating with the steam space of one of the upper drums, one of the upper drums having 'no steam circulators directly connecting it with one of the other upper drums, and steam circulators connecting the steam spaces of two of the upper drums, the only water circulator connections between the upper drums being through said groups of tubes whiclrprovide recirculation in the upper drums.

2. In a water tubesteam boiler, a boiler setting, a middle steam and water drum located between two similar drums at the top of the setting, tubes leading-from-said drums to a lowerwater chamber, baffles dividing the tubes into a plurality of separated banks located in separate gas passes extending throughthe setting, a lesser number of the tubes in a bank leading to a drum from which a greater number of tubes extend downwardly through an adjacent gas pass of higher temperature, the tubes in a bank being bent at their upper ends so as to constitute diverging groups of tubes, secondary baiiles between adjacent upper drums and having diverging portions extending along'diverging tubes of said divergin groups of tubes, said secondary baffles forming gas pass walls guiding the furnacegases at their-turns, a steam ofi -take connection communicating with the steam space of one of the upper drums, one of the upper drums having neither steam nor water circulators directljhconnecting it with one of the other upper drums, and steam circulators connecting the steam spaces of two-of the upper drums and extending over the'niiddle drum and. having no direct connection therewith, the only water circulator connections betweenthe upper drums being through said groups oftubes whichprovide recirculationinthe upper drums. I b l i 3. In a water tube steam boiler, a boiler setting, a middle steam and water drum located tubes extend downwardly through an adjacent gas pass' of higher temperature, the tubes in a bank being bent at their upper ends'so as to constitute'diverging groups of tubes, secondary baffles located between adjacent upper drums and above said diverging groups of tubes, said secondary bafiies forming gas pass walls guiding the furnace gases at their'turns, a steam offwhich provide recirculation in the upper drums;

4;. In a steam boiler of the Stirling type, a steamoff-take drum, a rear drum, a front drum, first steam circulators extending from the steam space of the front drum over the oif-take drum to the rear drum and constituting the only direct connection between, the front and rear drums, second steam circulators extending from the steam space of the reardrum to the offtake drum and constituting the only means connected to the'steam space of the off-take drum delivering steam thereto directly from another drum, a Water drum, a furnace, baflies providing 'a' plurality of gas passes, 'a first set of tubes connecting the front drum and the water drum, a second set of tubes directly connecting the rear drum and the water drum and extending through one gas pass to constitute the only circulatory means connected-to the water space of therear drum, a third set of tubes connected directly to the oiI-take and water drums and divided so that more of its tubes are in a gas pass of a temperature higher than the gas pass in which its remaining tubes are located, and steam and water separation baffles in the steam space of the off-take drum and located in the path of mixture discharge from the tops of the third set i nection between those drums, a steam offtake connection leading from the rear upper drum, and a feed water connection to the oiftake drum delivering feed water thereto so that it may free- 1y contact with such circulating boiler water as enters the off-take drum, the lower drum constituting an unobstructed mixing chamber.

6. In a steam boiler of the Stirling type, three upper steam and water drums including a rear steam 'offtake-drum, a water drum-below the steam and water drums, groups of tubes each directly connecting an upper drum with the water drum, gas pass boundary bafiles dividing groups of the tubes, steam circulators extending over the middle upper drum and directly connecting the front and rear upper drums, other steam circulators directly connecting the'middle upper drum to the rear drum and constituting the only direct connection between those drums, a steam offtake connection leading from the rear upper drum, 'and'a feed water connection to the offtake' drum delivering feed water thereto in contact with such circulating boiler water as enters the oif-take drum, the lower drum constituting an unobstructed mixing chamber.

' HOWARD J. KERR.

IVAR L. LANGVAND. 

